Mingw64 build failure

["Willgerodt, Felix" <felix.willgerodt@intel.com>]

Hi everyone,

I have some problems cross-compiling the latest gdb master branch with mingw64.
I tried a couple of different mingw64 versions on Ubuntu and Fedora 
(and even mingw64 from msys2 on Windows).

On my Fedora 34 with mingw64 in this version:
gcc version 10.3.1 20210422 (Fedora MinGW 10.3.1-2.fc34) (GCC)

I always get this error:

checking for sys/param.h... yes
checking for pid_t... /users/username/sources/gdb/gnulib/import/closedir.c: In function 'closedir':
/users/username/sources/gdb/gnulib/import/closedir.c:58:11: error: 'DIR' has no member named 'current'
   58 |   if (dirp->current != INVALID_HANDLE_VALUE)
      |           ^~
/users/username/sources/gdb/gnulib/import/closedir.c:59:20: error: 'DIR' has no member named 'current'
   59 |     FindClose (dirp->current);
      |                    ^~
make[5]: *** [Makefile:2188: closedir.o] Error 1
make[5]: *** Waiting for unfinished jobs....
yes


I see the same issue with the gdb-11-branch. Gdb-10 still compiles.
I have little knowledge with mingw and even less with gnulib. So before opening a Bugzilla,
I thought I would ask here, as there seem to be others compiling GDB with mingw64.
Has anyone seen this before?

I configure gdb like this:

$src/gdb/configure \
    --host="x86_64-w64-mingw32" \
    --build="x86_64-pc-linux-gnu" \
    --disable-binutils \
    --disable-gas \
    --disable-gprof \
    --disable-inprocess-agent \
    --disable-intl \
    --disable-ld \
    --disable-source-highlight \
    --without-mpfr \
    --with-libgmp-prefix="/users/username/builds/gmp/install"

GMP is also cross compiled as a static library:

$ tree install/
install/
------ include
-- - - ------ gmp.h
-- - - ------ gmpxx.h
------ lib
-- - - ------ libgmp.a
-- - - ------ libgmp.la
-- - - ------ libgmpxx.a
-- - - ------ libgmpxx.la
-- - - ------ pkgconfig
-- - -     ------ gmp.pc
-- - -     ------ gmpxx.pc
------ share
    ------ info
        ------ dir
        ------ gmp.info
        ------ gmp.info-1
        ------ gmp.info-2

But even if I remove “--with-libgmp-prefix”, I get the same error.

Thanks,
Felix
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